source: buchla-68k/orig/BUCHLA/PTOFTAB.C@ 6099cac

/*
   =============================================================================
        ptoftab.c -- generate a pitch to frequency table
        Written by:  D.N. Lynx Crowe -- see VER below for version
   =============================================================================
*/

#define VER     "Version 2 - 1987-12-19"        /* version ID string */

#define DEBUGIT         0

#define FILEOUT         "PTOFTAB.OUT"           /* output file name */
#define MAXPIT          10960L                  /* maximum pitch (cents) = C9 */

#include "stdio.h"
#include "math.h"
#include "stddefs.h"

double  j;
double  m;
double  kj;
double  kl;
double  km;

FILE *fp;

/* 

*/

main()
{
        register long i, k;
        register unsigned long n;

        printf("Buchla 700 Pitch to Frequency Table Generator %s\n", VER);

        if (NULL EQ (fp = fopen(FILEOUT, "wa"))) {      /* open output file */

                printf("ERROR:  Unable to open [%s] for output.\n", FILEOUT);
                exit(1);
        }

        kj = (double)MAXPIT / (double)1200.0;
        kl = pow((double)2.0, kj);
        km = ((double)10.0 / kl);

#if     DEBUGIT
        printf("Using km = %12.8f,  kl = %12.8f, kj = %12.8f\n", km, kl, kj);
#endif

        printf("Writing output to [%s] ...\n", FILEOUT);
        fprintf(fp, "/* Pitch to Frequency */\n\nunsigned ptoftab[] = {\n\n");

        for (i = 0L; i < 256L; i++) {

                k = i << 6;
                j = (double)((k LE MAXPIT) ? k : MAXPIT) / (double)1200.0;
                m = km * pow((double)2.0, j) * (double)2.0;
                n = (unsigned long)((m > (double)10.0 ? (double)10.0 : m)
                        * (double)100.0) << 5;

                fprintf(fp, "\t0x%04.4x%c\t/* %3d:  %10.5f %6d %10.5f */\n",
                        (0x0000FFFFL & n), (i < 255L ? ',' : ' '), i, m, k, j);

#if     DEBUGIT
                printf("%3d:  m = %10.5f, n = $%04.4x, k = %6d, j = %10.5f\n",
                        i, m, (0x0000FFFFL & n), k, j);
#endif
        }

        fprintf(fp, "};\n");
        fclose(fp);                     /* close the file */
        printf("\nProgram complete.\n");        /* say we're done */
        exit(0);                        /* go away */
}